Where the wave changes direction at the boundary between two materials

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What is refraction in terms of wave action?

A change in speed

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How do waves react when moving through shallow water?

Frequency remains the same, wavelength decreases

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How do waves react in deeper water?

Speed increases, direction change AWAY from normal

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Are waves faster in deep or shallow water?

Deeper

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How do waves react when passing between materials of different optical densities?

They refract

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How do waves react when passing from air to glass?

Slow down, bending towards the normal

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How do waves react when passing from glass to air?

Speed up, bending away from normal?

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Define Total Internal Reflection?

The wave is reflected back into the medium.

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When does total internal reflection occur?

When the wave is moving more from a more optically dense material to a less optically dense material.

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Describe total internal reflection

Increasing the incidence angle pushes the refraction angle closer 90 degrees. It reaches the critical angle (r =90) where it refracts along the boundary, incident angle above the critical angle makes the wave reflect back into the material